Railway signaling



Oct. 16, 1928.

G. W. BAUGHMAN RAILWAY "SIGNALING Original Filed Oct. 26, 1926 3 she t -sh t l 7hrnnn INVENTOR. m Q. MBau c9 EZ Q Oct. 16, 1928.

. G. w. BAUGHMAN RAI LWAY S IGNALING Original Filed 001;. 26, 1926 5 Sheets-Sheet 2 E mE INVENTOR G. W. Bau hmnn, h

Oct. 16, 1928. 1,688,173

G. w. BAUGHMAN RAILWAY SIGNALING Original Filed Oct. 26, 1926 3 Sheets-Sheet 5 Relay J Relayif Voltage in 9 Voltage in Windinq4 of Winding 6 of each RelayJ each Rebaylf J Vormal J ReVense A 4 Open JD Normal. [Tl-q 5 I V g Y 7' J Normal 7 lf Vormal J Rer/ens'e Aif /vormal J K INVENTORZ v G-W-5Qu7hrnen,

Normal Reverse Normal ReVens'e AA m Patented Get. 16, 1928.

GEORGE W. BAUGHMAN; or EDGEWO'OD: Benches, i ENiwsyLvA'NiA, issmfion meme UNION SWITCH & siGNAL eoMPAn'Y;

PORATION OF PENNSYLVANIA.

RAiLwAY sInA-mn Applieation filed October 2 6, 1:326; Seril N 0 ilenewe d Mefch 1S 1928 My inve'nfion lfel'atee to rziilW-a'y signaling, and particularly 130 Signaling of the type 111'; volving' fi'aek' eireuits. O'ne feetu'i'ejeff my invention is the provision of means 'fdf p-r'odneing considerable number of i'nc lica'tion's' Without line 'Wifes'. v

I W'iH descrihe' one form of ap zmtirs embodying my inventionand will then point out the novel fe'zifiuies thereof in claims.

' In the aeeo'mpzmying; drawings, Figs, 1 and I, when placed end to endin the order named, constitute a diagrammatic View showing one foixnof appe rzitus;ernhhflying I'fl y invention. Fige'. 2 to 8 inclusive, area was illustrating the operetfo'n of the tf'ae'k relays shown in Figs; 1 and 1;". e Referring to Figs; 1 and 1 the reference el l zua cfce'rs' l and 1 designate theitfa'ck Iaiil of a. railway, along Wh ch tffifi'ie normally moves the direction indie ifiiby; the 51- r'oW. These rails aleQchvlde'd'hy Insulated r'ep'mkiingj to the Ide'gitibn, the prime of which 'Is connected Wlfl a w f.-

L Is connected across the firael T3118 es from" 1 5 windinge 5.

the es- A-B. and from the lower track rail 1 of this section.throughcontact 12 of relayKt and contact '7 of relay J to the right-hand terminal of secondary 19. The current thus supplied toithe railsof section AB 18 of WhatI will term normal relative. polarity andit will be seen that it is full-Wave alternating current. Relay J is energized in the normal direction and relay'K is deen' ergized'. The conditions in these relays are 1 indicated in Fig. 3, from WhiclrWill be seen that the voltage in Winding 3 of relay J is in'phasewith the'voltage in winding 1 of this relay F 2), whereas the alternatingYour.- "rent in inding 5 of relay K w ll, not cooperate iv iththe direct currentin indingfi to produce torque in the relay. Lampl of signal S islightedythecircuit being from therleft-hand terminal of secondary 19 of transformer L through contacts 14: of relay K lamp land contact 11 of r'ght-hand terminal ofsecondary 19.

' I Thetrack'circuitfor section B:Cisfroin ithe left-handterminal of the secondary 19 of transformer L throu h contact 8 of relay J contact 12 ofrelay K to rail 1 and from' rail 1 through contact 13 of relay K and Contact 7 of relay J to therighthand terminal of secondary 19. This cur.-

rent is of reverse relative polarity and is full-Wave alternating current, so that, as indica'ted in Fi 4 rela J is .ener 'izedun a a y b reverse direction andielayfK is opened.

I Lamp'2 of signal s is lighted through'a cir-' cuitwhich'ivill be obvious from the drawing. Referring now to section (l-'D, traclrcir cuit current flows from the'left-hand termim1 secondary 19 of transformer L through contact 8 ofrel'ay J and contact; 13 of relay'K to raill andfrom rail 1,; through contact 12 of relay K asymmetric unit and contact '7 of relay J .to the right-hand terminal of secondary '19. This curr'entfis of normal polarity, but due to] p the asymmetric unit 15 each positive halfwvave is blocked, and 'thef'cond'itions in re-' .laysJ and K areindicated in Figfj. The halfavav'e alternating current of normal rel- I being-obviousfroni 'the drawing.

secondary 19 of transformer L 'through ative polarity in vindingfi of relay J cooperates with" the alternating current windingt to energizethis relay in'the'nor mal direction and the'nni-directional current of -re"erse polarity 1n Winding 5 of relay IQ fco-operatesiwith the direct current in; Winding 6 toenergizje this relay in the reverse direction. Lamp 3 of, signal S is therefore lighted, the circuit for this lamp Referring now to section DE, the traclr' circuit isfrom the left-hand terminal of Contact?) ofrelay asymmetric unit 16, contact 12 offrelay K to the lower. track the upper rail 1, through K and contact 10 of rerelay J to the- 1,ess,173

lay J to the secondary 19. This current is of reverse relative polarity and the positive half-Wave is suppressed'by theQasymmetric unit 16, so that the conditions in the track windings of relayed? and K areasindicated in .F ig. 6; ItWill be noted that both relays JE-and K are energized in the reverse direction. Lamp 4 of signal S is *thereforelighted by virtue of a circuit which will be obvious from the drawing. A

Referring now to'sectioirE F, track circuit current flows from the left-hand terminalof secondary 19 'of transformer L through. contact 9 of relay'J contact 13 of relay K to track. raill, and from track rail 1, through contact .12 of relay K asymmetric'unit17 and contact 10',of relay J to secondary 19. This current is "of normal relative polarity and the negativehalfayaves are suppressed by the asymmetric unit 17, so that, as indicated in Fig. 7, relayJ' is energized in the normaldirection and relay .K is; also energized in the normal direction. 1 Lamps of signals is therefore lighted by virtue of a circuit which will be obvious fronithe drawing.

The track circuit for section F'Gr is from the left-hand terminal of secondary 19 0f transformer L through contact 12 of relay IQ to the lower track rail 1*, and from the track rail-1,' through contact 13 of-relay K the drawing.

' In section G H the track circuit current .floWs froni'the le'ft-hand terminal of sec ondary' 19, of transformer L through contact 12 of relay K to the lower rail 1, and'fromthe upper rail 1, through contact -13ofr( lay.K and asymmetric unit 21 to secondary lg. The conditions in section G H'are. therefore the same as thosein sectionF Gr, so that track relay J is energized in the reversedirection, track relay K is energized in the normal" lamp 60f signalS is lighted.

that in the formherein illustrated, each sig nal S gives sevenfdistinctiveindications, and

direction; and I a 'It ivillbe observed from the foregoing that this isfaccomplished Without any line Wires other than those which ould 'be required to supply alternating currentto the transformers L. y

1, Although "I have" herein ShOWIi and a.

scribed only one form of apparatus embodymg my invention,- it is understood that VELI'IOUS changes and ,n'iodifications may be made therein With n the scope of the appended claims without departing from the spirit and scope of my invention.

Having thus described my invention,

alternating current, and the second ofwhich has two windings and is selectively responsive to the relative phases of currents therein, means for constantly supplying one winding of said second device with alternating current of fixed phase, and means for supplying the said first device and also the second winding of said second device with full wave alternating current of normal or reverse relative polarity or with only the positive or only the negative half waves of alternating current of normal or reverse relative polarity.

2. In combination, two electro-responsive devices, thefirst of which is responsive to uni-directional current and to reversals of the polarity of such current but is not responsive, to full-wave alternating currentv and the second of which has two windings and is selectively responsive to the relative phases of alternating currents therein, means for constantly supplyingone winding of said second device withalteratin g current of fixed phase, and means for supplying the said first device and also the second winding of said second device with full-wave alter nating current of normal'or reverse relative polarity or with only the positive or only the negative half-waves of alternating currentof normal or reverse relative polarity.

8.1111 combination, two relays, the first of which is responsive to uni-directional current but not to fu.llwave alternating current, and the second of which has two windings and is selectively responsive to the relative phases of alternating currents or half-waves of alternating currents therein, means for constantly supplying one winding of said second relay with alternating current of fixed phase, means for supplying the said first relay and also thesecond winding of said second relay with full-wave alternating current of normal or reverse relative polarity or with only the positive or only the negative half-waves of alternating current of normal or reverse relative polarity, and signaling means con trolled by said relays.

at. In combination, a stretch of railway track divided into sections, two relays for each section, the first of which is responsive touni-directional current and to reversals of the polarity of such current, and the second or which has two windings and is selectively responsive to the relative phases of alternating currents or halt-waves of alternating currents therein, means for constantly supplying one winding of said second relay with alternating current ofiixed phase, said first relay and thesecond winding of said second relay being connected with therails of the associated section, means controlled bythe two relays for each section for supplying the rails of the section in the rear with toll-wave alternating; current of normal or reverse relative polarity and for at times blocking the positive half-waves or thenega tive half-waves of such current, and signaling means for said sections controlled'by said relays. V A

In testimony whereof I affix m signature.

GEORGE W. BAU' HMAN. 

